Pulsator for milking machines



Patented duly 15, 1224.

KNUTIvAa LINDs'rRNr AND SIMON AXEL EFRAIN s'rERNER, or nJURsi-romvr,

SWEDEN.

lPUIvf'LLJJFOR FOR MILKING MACHINES.

Application iiled May 22, 1922. Serial No. 562,895.

To @ZZ 'whom t may concern.'

Be it known that we, KNUT lvAr. LrND- s'rRM and SIMON AXEL EFRAIM STERNER, subjects of the King of Sweden, residing at Djursholm, Sweden, have invented a new and/useful Pulsator for Milking Machines, of which the following is a specification.

The present invention refers to such pulsators for milking machines operating with a vacuum which are provided with valves controlled by diaphragme, such valves causing a vacuum to be produced alternately with atmospheric pressure in the teat cups.

The invention is principally characterized by the fact that the reversal of the valves from the one position to the yother is effected by the expansion of the air, without the medium of resilient means, and also by the fact that the pulsator isprovided with two pairs of valves rigidly and .immovably attached in relation to` each other onto a common spindle, and .further by the fact that the area of that valve iii-.each pairof valves which controls the supply of vacuum islarger than the area of; the corresponding valve controlling the supply of atmospheric air. f Y

The Figures 1 and 2 eofthe accompany- Ving drawing illustrate tworembodiments of the invention.

According to the drawing, the pulsator is composed of two halves 1 and 2, held together by means ofthe'screws 3. Between lthe halves 1 and 2 there is a space which is divided in two chambers 5 ,and 6 bythe diaphragm 4 which is jammed between the partsl and 2. The outer ends of the halves 1 and 2 form together ywith thecovers 7 and 8` screwed thereon the valve chambers 25 and 26 for ythe two pairs of valves 14 and 15.V The one cover 7 is provided with Aan opening 9 for a tubing socket aifording connection with the vacuum conduit by means of a rubber tubing, not shown in the drawing. vThe two valves 10 and 12 or 11 and v13 vrespectively of each pair of valves are arranged on one andthe same valve -body 14 or 15 respectively. These ytwo valve bodies are rigidlyattached tol either end of a tubular spindle 16 extending vacuum prevails in the valvey chamber fthe chamber .6 and the part 31 of thevalve chamber 26, while at the same time atmosphericuair pressure is prevailingin the valve Ychamber26and. the chamber :5.) Thusthe through the diaphragm 4, and are retained thereon byv means of nuts. -The vspindle is :movable in its longitudinal direction, and f the ends thereof open-underneath the covers '7 and 8. The valve seats V17 and 18Yfor the spindle. .i .The pulsator according kto the invention vacuum valves 10 and 11 `are arranged on the inner sides ofthe covers andthe valve seats 19 and 20 for the fresh-air valves 12 and 13 are provided on the halves 1 and 2.

These parts 1 and 2 are provided partly with passages 21 and 22 for the supply of air under atmospheric pressure, andvpartly with passages 23 and 24 connecting the valve chambers 25 and y26 with the .chambers 5 and 6 respectively7 on either ,side of the diaphragm. In one place between the valves 10 and 12, the chamber 25 is connected with the passage 23 by means of a conical opening adapted to be throttled by means of the regulating screw 27. A cor-` responding -arrangement is provided for .connection between the valve chamber 26 their valve seats when the cooperating vacuum valves are sucked to their valve seats, and when the vacuum valve is moved ofi' its valve seat -through the action of the diaphragm, the fresh-air valve. is at the 'same time loosened from its valve seat. By this means an instantaneous reversal is attained through the expansion of the air, which Vconstitutes the characteristic feature of the present invention.

The difference `between the two embodiments shown in Figs. 1 and 2 is to Ybe found in theway the respective valve seatsare arranged. VVhilein Fig. 1 the valve seats are disposed laterally of the central spindle 16., Fig. 2 shows theV valve seats as being yarranged concentrically about .the i central operates in the followingV manner:

In the position shown in the' drawing vacuum valve 15 is being sucked conto its seat, whereby the fresh-air valve 12 is also pressed onto its seat, thereby cutting olf the admission of the atmospheric air from the pulsator. Depending on the throttling by .means of the regulating screws 27 and 28, vacuum or fresh airrespectively is conducted at a higher or lower rate from the valve chamber 25 oi" 26 respectively, to the corresponding chambers 5 and 6. Through this Vthe diaphragm is pressed up- 4Wards from the position shown in the drawing. Whenyth'e pressure on the loiver side of the diaphragm overweighs the vacuum sucking the valve 11 against its seat, the valve will be jerked loose, and through 'the expansion of :the air enclosed `vvithin the chamber 6 which, 'as 'is understood, has a pressure exceeding the partial vacuum in ther chamber 5, the valve spindle Will be instantaneously thrown over together with its two pairs vof valves into the oppositeextremeposition, after Which the cycle of operations 'above described will be repeated. As `Will be found from the foregoing, lthe pulsator construction according to I'the present invention is distinguished in that it possesses only one movable lpart 16, and by the fact that rthe valves do not slide on the spindle, thus preventing Wear and leaks involvedtli'ereby, and,`iinal ly,`=by the "fact that all resilient devices for `the reversal of the valves are eliminated, 'whereby `greater safety in 'operation and "reduced manufacturing costs Will be attained.

Vhat We claim is:

1. In pulsators (for Imilking machines operatingfvvith vacuum, the combination'of tWo pairs of valves -Which are rigidly vmounted on a common body, movable longitudinally, means vfor givings'aid ybody and the valves a reciprocating movement, said v,means consisting a vibratory diaphragm, connected With *the` valves, the'one valve in'each pair 'serving'to 'control the/'vacuum supply, and the other to control the supply :of atmos- Lpheric air, the atmospheric pressure Vvalve in the one pair andthe vacuum :supply pipe -in the other pair being adapted'to occupy the yclosed "position simultaneously.

2. In pulsators formilking machines `operating :With vacuum, the combination of tvvopai'rs of valves Which are mechanically connected so a'sto movet'ogeth'er, the one 'valve in each pair serving to control the vacuum supply, 1and the otherto 'control ythe supply of atmospheric air, means for 'giving `said valves a yreciprocating movement, sai

means consisting l of' a vibratory diaphragm,

connected ivithtli'e valves, the one pair of valves `being `located on `the one side v`of the diaphragm and theotlierl'pair ofvalves on theopposite side thereof. 4

fc3. In pulsators V`for milkingmachiries-op- *erating with vacuum, f the combination of degree ofY tivo pairs of valves which 'are rigidly mounted on a common body, ymovable longitudinally, means for giving said body and the valves a reciprocating movement, said means consisting of a vibratory diaphragm, connected with the said body, the one valve in eachpair serving to control the vacuum supply, aiid the other to control the supply of atmospheric air, all the valves being arranged co-axially, the atmospheric pressure valve in the one pai-r and the vacuum valve in the other pair being adapted to 'occupy the `closed position simultaneously.

4;. In pulsators for milking machines operating With vacuum, the conibinaticn of tivo pairs of valves Which are rigidly .mounted on a common spindle, movable longitudinally, means for giving said spindle and the valves a reciprocating movement longitudinally, the one valve in eacli 'pair serving 'to control the vacuum supply, and they other to control the supply of atmospheric air, said spindle being formed as a tube, through Which the housing "for the one vacuum valve andthe housing for the other vacuum valve communicate with each other.

5. In pulsators for milking machines operating With vacuum, the combination of two pairs of valves, Which are mechanically connected so as to move together, means for giving the valve pairs a reciprocating movement, said means consisting of a vibratory diaphragm connected lwith the valves, 'the one valve in each pair serving to 'control the Yvacuum supply, and the other to control the supply of atmospheric fairythe atmospheric pressure valves having a smaller area, 'than the vacuum valves.

6. "In 'pulsators -formilking vmachines operating With vacuum, the combination `of 'two pairs of valves, Which are mechanically connected so as lto moveft'ogethen means Efor givingthe yvalve pairs fa Vr'eci-procatingmovement, said means consisting of a vibratory "diaphragm `connecte"d lwith "the valves, the one valve in leac-h pair serving to control fthe vacuum "supply, fand the other to control Zthe supply7 of -fatmospheric air, the atmospheric pressure valves havingfa smaller area, than ythe vacuum valves, 'Which 'latter have *a smaller area than 'the diaphragm, the one pair of valvesbeing located on the one side of -the ldiaphragm and'th'e other pair of valves Aon the opposite side-thereof. 4

7. In pulsators for milking inachines'operating 'With vacuum,`7 the combination oftvvo Vmentfsaid meansconsistin'g of a vibratory diaphragm connected vviththe valves, the

one `valve in each pair serving tocoiitrol 'the va'cu'iiiii'supply,*aiid the other to control the suliply'of lat`i`i'i`ospheric air, fm'ea'ns 'for causing the'vacuum 'pressure'to set infull-exnected rigidly so as to move together, means for giving the valve pairs a reciprocating movement, said means consisting of a vibratory diaphragm, connected with the valve, the one valve in each pair serving to control the vacuum supply, and the other to control ythe supply of atmospheric air, means for causing the vacuum pressure to act in `full extent, on the one side of the diaphragm, simultaneously as a reduced atmospheric pressure acts on the other side of the diaphragm, and for causing the atmospheric pressure to act in full extent on the one side of the diaphragm simultaneously as a reduced vacuum pressure acts on the other side of the diaphragm, the one pair of valves being located on the one side of the diaphragm and the other pair of valves on the other opposite side thereof.

9. In pulsators for milking machines operating with vacuum, the combination of a casing, a chamber in said casing, a vibratory diaphragm dividing said chamber in two chambers, two other chambers in said casing, said chambers being arranged at each side of the first chamber, a spindle extending through all the said chambers, and movable longitudinally, two pairs of valves, arranged respectively in the two latterchambers, the one valve in each of these chambers serving to control the vacuum supply and the other to control the supply of atmospheric air, all the valves and the diaphragm being attached to the spindle.

10. In pulsators for milking machines operating with vacuum, the combination of a casing, a chamber in said casing, a vibratory diaphragm dividing said chamber in two chambers, two other chambers in said casing, said chambers being arranged at each side of the lirst chamber, a spindle extending through all thesaid chambers, and movable longitudinally, two pairs o valves arranged respectively in the two latter chambers, the one valve in each of these chambers serving to control the vacuum supply and the other to control the supply of atmospheric air, an inlet for the atmospheric air to each of said chambers, the walls between the chambers serving as a guide for the saidy spindle, the inner opening of each air inlet channel being closed from `communication with the play between the spindle and its guide, when the corresponding air inlet valve is in the closed position, all the valves and the diaphragm being attached to the spindle.

In witness whereof we have hereunto set our hands in the presence of two witnesses.

Witnesses r Y f ERIC HALGE, L. BERG voN LINDE. 

